Aurora PostgreSQL is not supported on db.t3.small. Please refer here https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Concepts.DBInstanceClass.html#Concepts.DBInstanceClass.SupportAurora for the supported instance classes vs the DB Engines. On the db.t3 – burstable-performance instance classes, only db.t3.large and db.t3.medium are supported for Aurora PostgreSQL, on versions 14.3 and higher, 13.3 and higher, 12.7 and higher, 11.12 and higher.
Hope this helps.
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